In adding and subtracting fractions with unlike denominators, you have to get a least common denominator which is exactly like the least common multiple it just so happens to be in the denominator.

The secret to successfully adding or subtracting fractions lies in one crucial concept: finding a common denominator. Think of it like trying to combine different sized pieces of a puzzle—you ...

Use visual fraction models to add and subtract fractions with the same denominators.

There are two rules to remember when adding or subtracting fractions. The fractions need to have a common denominator. This means the denominator has to be the same. You only need to add or ...